The short answer is “no.” The longer answer is “for almost everyone, still no.” The even longer and needlessly provocative answer is that “any PhD gained by a Christian has (or should have) Apologetics in it.”
I often get asked the title question, especially ever since Southwestern Seminary rolled out its new MA in Christian Apologetics. Christian Apologetics, by its very nature, is a multidisciplinary field of study. To be sure, there are the characteristic areas that typically comprise a study of apologetics. For example, a mainstay of the discipline is issues in Philosophy of Religion. In Phil. Religion we talk about arguments for God’s existence, the coherence of theism (including doctrines that might appear to be in tension with each other as well other problems, such as the problem of evil). This of course fits well within the scope and purpose of Apologetics. Thus, philosophy is a really important area for doing apologetics. However, doing a degree in philosophy does not adequately prepare one to be able to defend against the great variety of challenges and objections that come from other disciplines.